package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Override
    public void add(ShoppingCartDTO shoppingCartDTO) {
        log.info("添加购物车:{}",shoppingCartDTO);
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //先查看购物车中是否有该商品
        List<ShoppingCart> product = shoppingCartMapper.list(shoppingCart);
        // 如果有，数量加1
        if (product != null && product.size() > 0){
            ShoppingCart cart = product.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            // 如果没有，添加到购物车，数量默认为1
            Long dishId = shoppingCart.getDishId();
            if (dishId != null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                Setmeal setmeal = setmealMapper.getById(shoppingCart.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.save(shoppingCart);
        }
    }

    @Override
    public List<ShoppingCart> listShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);
    }

    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        //先判断是否该商品的数量是否大于1
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> product = shoppingCartMapper.list(shoppingCart);
        if (product != null && product.size() > 0){
            ShoppingCart cart = product.get(0);
            Integer number = cart.getNumber();
            // 如果是，数量减1
            if (number > 1){
                cart.setNumber(cart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(cart);
            }else {// 如果等于1，删除该商品
                shoppingCartMapper.deleteById(cart.getId());
            }
        }


    }
}
